植物由来エンプラ・ポリアミド１１の衝撃特性の評価

概要

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Stress-strain curves of the polyamid11, which is one of bio-based plastics (plant-derived plastics), were measured over a wide range of strain rates from 10-4 s-1 to 103 s-1, using a quasi-static compression testing machine and a split Hopkinson pressure bar (SHPB) method. Youngs modulus and flow stress were increased with increasing strain rate, as is commonly seen in most machine materials. We confirmed the effects of water absorption and temperature from 5 °C to 65 °C on flow stress. The specimens were soaked in distilled water at 35°C. After 30 days, water absorption in the specimens did not increase much and the percentage of water absorption was 1% of their weight. The flow stress was decreased with increasing water absorption. Youngs modulus and flow stress were decreased with increasing temperature, as is commonly seen in most engineering plastics.